The plumbing concepts should be similar to the farmall version. Do a search for "charles todd." He had a farmall 504 and beefed up the hydraulic system with a power beyond loader valve and kept the factory parts functional.
components tucked under the cowl are going to limit your modification, so you might have to do things a bit more crudely. If you are creative, it will still look good and function flawlessly.
I assume you have a hydraulic pump in the clutch housing. I would follow the hose from the pump to the flow divider under the cowl where the steering pilot valve is attatched and one of the lines coming out goes to the remote valve. remove that line at both ends provided there is room to install at least a 5/8" i.d. high pressure hose with necessary fittings that goes to the inlet of the power beyond type loader valve. The out/beyond port is attatched to a high pressure hose of 1/2" i.d. or larger that will now feed the existing factory remote. there is a return port back up on the loader valve that will need to be plumbed to the reservoir (such as a convienient trans case fill, check, or drain plug) with a 3/8" i.d. hose. you might be able to get by with 300psi hose here, but 1500 psi or greater is more abraision resistant.
should there not be room under the dash for a large hose, you will have to make your in and out connections at the remote valve body pressure inlet that is fed from the flow divider. the line would have a hose attached to it going to your loader in and the loader beyond would now feed the remote. With stock hydraulic pump, you could get away with 1/2i.d. hose throughout, but if you upgrade to the 17 gpm pump, use 5/8 to the loader, 3/4 would work too, no bigger. There are all kinds of formulas, charts, and researched engineering practices of hose size--too small is too restrictive, but too large decreases the velocity of the fluid and also hampers performance. I looked at a chart for another project last year and i seem to remember 5/8 to 3/4 is about the sweet spot for an ag tractor under 20 gpm and in the 1800 psi area.
no matter what pump you have or get, do not use the 2 piece donuts. get the one piece oval filter. If you upgrade to 17gpm consider the fat oval filter and a filter cover extension.
Charles todd did a good job with his. He put the loader first in plumbing chain before his power steering and sometimes cannot turn the steering wheel until the loader is done being cycled. That's why i have you going to the flow divider in my instructions.
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